Tuesday, December 18, 2018

[Herpetology • 2018] Phyzelaphryne nimio • A New Species of Phyzelaphryne Heyer, 1977 (Anura: Eleutherodactylidae) from the Japurá River Basin, northwestern Brazilian Amazonia, with A Discussion of the Diversity and Distribution of the Genus


Phyzelaphryne nimio 
Simões, Costa, Rojas-Runjaic, Gagliardi-Urrutia, Sturaro, Peloso & Castroviejo-Fisher, 2018


Abstract
We describe and name the second species of Phyzelaphryne (Brachycephaloidea, Eleutherodactylidae), from northwestern Brazilian Amazonia. Phyzelaphryne nimio sp. nov. is distinguished from its only congener, Phyzelaphryne miriamae, by its smaller body size and the anatomy of the carpal and metacarpal regions, with relatively larger (sometimes fused) supernumerary carpal and metacarpal tubercles. Molecular phylogenetic analyses based on fragments of the mitochondrial genes 16S rRNA and COI suggest that the currently known distribution of the species is restricted to its type locality and other areas within Estação Ecológica Juami-Japurá, state of Amazonas, Brazil. Based on molecular, morphological and bioacoustic evidence, we assigned other specimens recently collected in Parque Nacional do Jaú, state of Amazonas, Brazil, to P. miriamae, extending the species’ known geographic distribution north of the Amazon River.

Keywords: Amphibia, Amazonia, Brazil, conservation units, DNA barcoding, morphology, Phyzelaphryninae, Terrarana



twitter.com/RojasRunjaic



Pedro Ivo Simões, João Carlos Lopes Costa, Fernando J.M. Rojas-Runjaic, Giussepe Gagliardi-Urrutia, Marcelo José Sturaro, Pedro L.V. Peloso and Santiago Castroviejo-Fisher. 2018. A New Species of Phyzelaphryne Heyer, 1977 (Anura: Eleutherodactylidae) from the Japurá River Basin, with A Discussion of the Diversity and Distribution of the Genus.  Zootaxa. 4532(2); 203–230. DOI:  10.11646/zootaxa.4532.2.2

    

[Botany • 2018] Casearia austroafricana (Samydoideae, Salicaceae) • A New Species of Casearia from South Africa


Casearia austroafricana A.E.van Wyk, R.G.C.Boon & Retief

in van Wyk, Boon & Retief, 2018. 
Photographs: R.G.C. Boon. 

Abstract
Casearia austroafricana, a new species from South Africa, is described, illustrated, mapped, and compared with the two other currently accepted southern African members of the genus, namely C. gladiiformis and C. battiscombei. The new species belongs to Casearia sect. Casearia, and is confined to the provinces of KwaZulu-Natal and Eastern Cape. Known for over 100 years by botanists, material of this species has initially been assigned to C. junodii, but from about the 1960s to C. gladiiformis, for which the former is considered a synonym. Casearia austroafricana is readily distinguished by being a tall (up to ca. 30 m) subcanopy or canopy tree associated with temperate or subtropical forest, and in having twigs of young growth usually markedly zigzag, leaves of mature growth with blade relatively thin, principal lateral veins usually 8–10 pairs, margin distinctly serrate-crenate, flowers with the ovary glabrous, and capsules with relatively few seeds (3 or 4). A conservation assessment of “Least Concern” is recommended for this species based on IUCN Red List categories and criteria. Ecological associates are mentioned, including epiphytic ferns, orchids, birds attracted by the arillate seeds, and Lepidoptera (moths) for which it serves as host-plant.

Keywords: Afromontane Forest, Casearia sect. Casearia, Eastern Cape, epiphytes, KwaZulu-Natal, Lepidoptera, Maputaland Centre of Endemism, Maputaland-Pondoland-Albany Hotspot, Pondoland Centre of Endemism, Samydaceae, Scarp Forest, taxonomy, trees, Eudicots


FIGURE 2. Casearia austroafricana.
 A. Flowering branchlet. B. Flower. C. Flower; one sepal and half the staminal tube removed. D. Part of staminal tube opened out. E. Fruit. F. Dehisced fruit; seeds all shed. G. Seeds, both from same capsule and each covered by an aril.

Scale bar = 10 mm (A, E & F), or 1 mm (B–D & G). A–D from Luckhoff s.n., sub NH 32946, E & G from Miller 5824 and F from Miller 652. Artist: Daleen Roodt.

FIGURE 1. Casearia austroafricana.
A. Fruiting branchlet placed horizontally; to view original hanging orientation, turn plate 90º clockwise. B. Flowers. C. Ripe and dehisced fruit.
Photographs: R.G.C. Boon. 

Casearia austroafricana A.E.van Wyk, R.G.C.Boon & Retief, sp. nov. 
 Casearia austroafricana resembles C. gladiiformis, but is easily distinguished from this species by, amongst others, growing under temperate or subtropical conditions, always in or near forest (vs. tropical, and in either open woodland, thicket or forest), with the trees becoming taller (>20 m vs. <10 m), in having young twigs usually markedly zigzag (vs. straight or weakly zigzag), leaves of mature growth with blade relatively thin (firmly chartaceous vs. coriaceous), margin glandular-serrate (vs. entire), ovary glabrous (vs. hirsute, at least towards the apex), and fewer seeds per capsule (3 or 4 vs. ca. 10)
....

Etymology:—The specific epithet is the Latin for “South Africa”, chosen because the new species is the only member of Casearia endemic to the country.

Common names:— Existing names include swordleaf, southern swordleaf, suidelike bosswaardblaar (Afrikaans), smozob (Zulu?; from Henkel s.n.) and qokama (Xhosa; from Acocks 12820).


Abraham E. van Wyk, Richard G.C. Boon and Elizabeth Retief. 2018. A New Species of Casearia (Samydoideae, Salicaceae) from South Africa. Phytotaxa. 383(3); 273–282. DOI: 10.11646/phytotaxa.383.3.4


[Botany • 2018] Zingiber leucochilum (Zingiberaceae) • A New Species of Zingiber with Running Rhizome from Sichuan [Taxonomic Studies on Zingiber in China VI]


Zingiber leucochilum  L.Bai, Škorničk. & N.H.Xia

in Bai, Leong‐Škorničková, Xia & Li, 2018. 

Abstract
Zingiber leucochilum L.Bai, Škorničk. & N.H.Xia (Zingibereae, Zingiberaceae), a new species from southeastern Sichuan, China, is described and illustrated with a colour plate. Notes on ecology, distribution and a preliminary IUCN conservation assessment are also provided. The new species is assigned to Z. sect. Cryptanthium Horan. and compared to five morphologically similar species from China which share the characteristic well‐elongated and running rhizome, namely, Z. emeiense Z.Y.Zhu, Z. leptorrhizum D.Fang, Z. pauciflorum L.Bai, Škorničk., D.Z.Li & N.H.Xia, Z. smilesianum Craib and Z. yunnanense S.Q.Tong & X.Z.Liu. A key to the above six species is provided and their distributions are mapped.

Figure 1. Zingiber leucochilum sp. nov. 
(A) plant habit, (B)–(C) detail of leaf sheaths, ligules and pulvini, (D) basal part of the pseudostem with inflorescence and part of the rhizome, (E) running rhizome.
Based on the type collection L.Bai et al. 13091040. Photos: Lin Bai.

Figure 2. Zingiber leucochilum sp. nov.
 (A) flower (front view), (B) flower (side view), (C) inflorescence, (D) single flower with bracteole attached and flower dissection, from left: fertile bract, bracteole, dorsal corolla lobe, two lateral corolla lobes, labellum with basally connate lateral staminodes (in ventral and dorsal view), ovary, flower tube and anther (side view), ovary with two epigynous glands.
Based on the type collection L.Bai et al. 13091040. Photos: Lin Bai.

Zingiber leucochilum L.Bai, Škorničk. & N.H.Xia sp. nov.

Etymology: The specific epithet is derived from the Greek leuco- (white) and -chilus (lipped) in reference to the uniformly white-coloured labellum of this species.


Lin Bai, Jana Leong‐Škorničková, Nian‐He Xia and De‐Zhu Li. 2018. Taxonomic Studies on Zingiber (Zingiberaceae) in China VI: Zleucochilum, A New Species with Running Rhizome from Sichuan.   Nordic Journal of Botany.  36(9); e01840. DOI: 10.1111/njb.01840

    

[Botany • 2019] Pre‐Pleistocene Origin of Phylogeographical Breaks in African Rain Forest Trees: New Insights from Greenwayodendron (Annonaceae) Phylogenomics


Greenwayodendron sp.

in Migliore, Kaymak, Mariac, Couvreur, et al., 2019.

Abstract
Aim: 
Palaeoecological records indicate that Pleistocene glaciations affected the African rain forest, probably causing its fragmentation, which could explain phylogeographical breaks documented in many tree species. This refuge hypothesis was further tested through species distribution models, hindcasting persistence during the Last Glacial Maximum. However, previous studies failed to estimate with sufficient precision the divergence time between phylogeographical entities to confirm their Pleistocene origin. Developing genomic tools on a representative tree of mature rain forests, we test if parapatric genetic clusters documented in widespread tree species can be interpreted as the legacy of past population fragmentation during the last glacial period(s).

Location: Tropical Africa, Guineo‐Congolian forests.

Taxon: Greenwayodendron (Annonaceae).

Methods:
To further test the Pleistocene refuge hypothesis by molecular dating, we sequenced the plastome of 145 individuals of the shade‐tolerant rain forest tree Greenwayodendron suaveolens and congeneric species, and genotyped the same samples using nuclear microsatellites to identify genetic clusters.

Results: 
Five plastid phylogroups of G. suaveolens occur in parapatry throughout Central Africa, following a spatial pattern generally congruent with genetic clusters. Four of them diverged 3.5–4.5 Ma, whereas the fifth one, located in the Cameroon volcanic line (CVL), diverged 8.3 Ma, in the range of divergence times between Greenwayodendron species, highlighting the key role of the CVL in hosting ancient lineages. Within phylogroups, most nodes were dated from 0.9 to 3.2 Myr and a correlation between haplotype divergence and spatial distance was still perceptible, indicating a slow population dynamic.

Main conclusions: 
The phylogeographical structures of Central African trees probably established during the Pliocene or early Pleistocene, and while they might have been reinforced during subsequent glacial–interglacial cycles, interglacial phases did not lead to genetic homogenization. Therefore, interpreting phylogeographical patterns of African trees must account for a much deeper past than previously assumed, and cannot be limited to the last glacial period.

Keywords: African rain forests, evolutionary history, Greenwayodendron, High‐throughput sequencing, molecular dating, nuclear microsatellites, phylogeography, plastome captures, Pleistocene glaciations




CONCLUSIONS
The well‐resolved plastome phylogeny of Greenwayodendron species challenges the accepted view of Central African forest historical dynamics by showing that phylogeographical patterns of mature forest trees can have a very ancient origin, pre‐dating the Pleistocene. Our results call for a reassessment of the reference time‐scale traditionally used to interpret phylogeographical patterns in African rain forest trees, earlier than the last glacial cycle. The long generation time of shade‐tolerant tree species, their limited dispersal capacity and their incapacity to colonize open habitats probably explain their slow spatial dynamics, which in turn induces genetic signatures of very ancient historical or biogeographical events.

    


Jérémy Migliore, Esra Kaymak, Cédric Mariac, Thomas L. P. Couvreur, Brandet‐Junior Lissambou, Rosalía Piñeiro and Olivier J. Hardy. 2019. Pre‐Pleistocene Origin of Phylogeographical Breaks in African Rain Forest Trees: New Insights from Greenwayodendron (Annonaceae) Phylogenomics. Journal of Biogeography.  DOI: 10.1111/jbi.13476  

[Botany • 2018] Rachunia cymbiformis • A New Genus and Species of Gesneriaceae from Thailand


 Rachunia cymbiformis D.J.Middleton.

Rachunia D.J.Middleton & C.Puglisi gen. nov.
in Middleton, Khew, Poopath, et al., 2018.  

Abstract 
Rachunia, a new genus of Gesneriaceae from Thailand, is described with a single species, Rachunia cymbiformis. Its relationship to the rest of subtribe Didymocarpinae is investigated through a phylogenetic study based on Bayesian Inference and Parsimony analyses of nuclear ITS and plastid trnL‐trnF (intron‐spacer) sequences. Morphologically, Rachunia differs from the related genera Codonoboea in the large boat‐shaped bracts and orthocarpic vs plagiocarpic fruit; from Microchirita in the bracts, wiry vs fleshy stem, the campanulate vs tubular corolla and the clavate vs chiritoid stigma, and from Henckelia in the clavate vs chiritoid stigma, large boat‐shaped bracts in the inflorescence, free and imbricate sepals, short and campanulate corolla, clavate stigma, and relatively robust orthocarpic fruit.

Keywords: phylogeny, Henckelia, Didymocarpinae


Rachunia cymbiformis D.J.Middleton. close-up of bracts and flower.
Photo by Manop Poopath. 

Rachunia D.J.Middleton & C.Puglisi gen. nov. 

Type species: Rachunia cymbiformis D.J.Middleton. 

Etymology: The genus is named in honour of the Thai botanist Dr Rachun Pooma of the Forest Herbarium Bangkok (BKF) to recognise his great contribution to our understanding of plant diversity in Thailand and the wider region.


Rachunia cymbiformis D.J.Middleton sp. nov. 

Etymology: The specific epithet ‘cymbiformis’ refers to the boat-shaped bracts in the inflorescence.


D. J. Middleton, G. S. Khew, M. Poopath, M. Möller and C. Puglisi. 2018. Rachunia cymbiformis, A New Genus and Species of Gesneriaceae from Thailand. Nordic Journal of Botany. 36(11); e01992. DOI: 10.1111/njb.01992


Monday, December 17, 2018

[Botany • 2018] Dendrobium mizanii (Orchidaceae: Dendrobiinae) • A New Orchid Species of Dendrobium Sect. Calcarifera from Terengganu, Peninsular Malaysia


Dendrobium mizanii R.Go & E.E. Besi

in Besi, Nikong, Mustafa & Go, 2018. 
Photos by DigitalDome. facebook.com/DigitalDome 

Abstract
Dendrobium mizanii, a new species to science belonging to Dendrobium Sect. Calcarifera was discovered in a summit region of a disturbed montane forest in Setiu, Terengganu, and named after His Majesty Sultan of Terengganu, Tuanku Mizan Zainal Abidin. A description, illustration, field and comparison with the closely related species D. crocatum from Peninsular Malaysia and D. doloissumbinii from Borneo are provided here.

Keywords: endangered, rescue, ex-situ, conservation, Dendrobium, new species, Monocots



Dendrobium mizanii R.Go et E.E. Besi, sp. nov.

 Type:— MALAYSIA. Terengganu: Setiu. ca. 1,300 m, ...

Diagnosis:—This species is very identical to Dendrobium crocatum Hook.f., a widely distributed species in Malaysia and Thailand, by having the plant almost similar morphologically with the stems slender, green-purplish, leaves lanceolate, flowers spreading with tip reflexed, and lip widely canaliculate but it clearly differs from the latter by having the lip 3- lobed, blade almost in the same length as the column (in natural position), midlobe widely rounded with apex decurved (curved downwards) and margin copiously undulate and crenate; mentum slightly bent downward; and roots distinctly thicker about 3 mm wide, white and covered with velamen. It shares similarities with D. doloissumbinii J.J. Wood on its stems up to 40 cm long, lip yellowish-green in with reddish-purple speckles and the midlobe apex wide, slightly decurved, but it differs by having the flower (less than 4 cm long) smaller, mentum (less than 2.5 cm long) shorter, and the lip distinctly 3-lobed with the apex copiously undulate. The D. doloissumbinii is also having blade much longer in length than the column (in natural position), similar to that observed in D. crocatum and other species in Sect. Calcarifera, including D. subflavidum Ridl. and D. lankaviense Ridl..  ...

FIGURE 1. Dendrobium mizanii, flower’s dissection.
A. Flower, top-lateral view showing the 3-lobed lip. B. Flower, lateral view showing decurved and copiously undulate lip apex. C. Flower, front view. D. Flower, closed-up lateral view. E. Flower, closed-up front view showing yellowish green with reddish purple speckles. F. Flowers at young stage during the pre-bloom period. G. Flowers at matured stage after the pre-bloom stage. H. Plant. I. Perianth. J. Lateral sepal. K. Petal. L. Dorsal sepal. M. Lip, flattened. N. Column apex showing stelids and rostellum. O. Anther-cap and pollinia. P. Column showing narrow foot.
Photos by DigitalDome.



Etymology:— This species is named after His Majesty Sultan of Terengganu, Tuanku Mizan Zainal Abidin. To commemorate His Majesty’s continuous dedications towards conservation ventures in Terengganu.

Distribution and Ecology:— The earliest specimen (holotype) was found in a summit of a montane forest in Setiu, Terengganu, at about 1,300 m above sea level, and growing terrestrially at the moist humus at the base of a tree. Then, the second specimen (isotype) was collected from the same area, but growing epiphytically on a medium-sized phorophyte tree.


  Edward Entalai Besi, Dome Nikong, Muskhazli Mustafa and Rusea Go. 2018. A New Orchid Species of Dendrobium Sect. Calcarifera from Terengganu, Peninsular Malaysia (Orchidaceae: Dendrobiinae). Phytotaxa. 383(2); 213–218. DOI: 10.11646/phytotaxa.383.2.7

[Entomology • 2018] Kasetsartra fasciaura • A New Genus (Lepidoptera: Tortricidae: Olethreutinae) from Thailand with the Description of Its Type Species


 Kasetsartra fasciaura Pinkaew, 2018. 


Abstract
Kasetsartra, gen. nov., is described from Thailand based on the type species, Kasetsartra fasciaura, sp. nov. Kasetsartra is characterized by a unique wing pattern, a conspicuous uncus in the male genitalia, and a dorsally expanded corpus bursae in the female genitalia. Adults, wing venation, and genitalia are illustrated, and their structure suggests a position in the tribe Enarmoniini.

Keywords: Lepidoptera, Kasetsartra fasciaura, Enarmoniini, Olethreutinae, Khao Yai National Park, new genus, new species


FIGURE 2. Living specimen of Kasetsartra fasciaura on sheet.

Kasetsartra Pinkaew, gen. nov. 
Type species: Kasetsartra fasciaura, sp. nov. 

Diagnosis: The new genus is characterized in the forewing by a deep notch below the strongly projecting apex; in forewing venation by three distinct transverse fascia of slightly raised, metallic golden scales; and by the very unusual course of the M−stem to between M1 and M2, R3 closely approximated basally and parallel to the stalk of R4 and R5, and CuA1 from below the angle of the distally narrowed discal cell. Diagnostic characters in the male genitalia are the absence of a costal process; a divided uncus with two long, widely separate ovate lobes with a sclerotized hook on outer corner; small projecting socii; an ovate cucullus with a deep semicircular depression beyond the spiniform seta on the mediobasal area of the cucullus; and ventral margin of cucullus with a row of five curved spiniform setae. The female genitalia are characterized by the sterigma in a deep excavation of sternum VII, with two parallel longitudinal spinulose ridges; the absence of a colliculum; a dorsally expanded posterior part of corpus bursae; and two unequal, triangular to thorn-shaped signa, one very small.
....

FIGURES 3−6. Adults of Kasetsartra fasciaura (scale bars = 2 mm).
3. Male adult, holotype. 4. Female adult, paratype (np4325).
5. Male head, paratype (np4346). 6. Female head, paratype (np4447).

Kasetsartra fasciaura, sp. nov.

Etymology: The specific epithet refers to the golden (= auratransverse band (= fascia) of the forewing. 

Distribution: The species is known only from central Thailand, collected in dry dipterocarp forest of the Khao Yai National Park, with Dipterocarpus obtusifolius as the dominant tree. 

FIGURE 1. Dry Dipterocarp forest at Khao Yai National Park.

    


Nantasak Pinkaew. 2018. Kasetsartra Pinkaew (Lepidoptera: Tortricidae: Olethreutinae), A New Genus from Thailand with the Description of Its Type Species. Zootaxa. 4532(1); 95–103. DOI: 10.11646/zootaxa.4532.1.5

[Chilopoda • 2018] Taeniolinum neusicus • The First Taeniolinum (Geophilomorpha: Ballophilidae) from the Andes Mountains and Colombia


Taeniolinum neusicus
Tulande-M, Prado & Triana, 2018


Abstract
Taeniolinum neusicus sp. n. is described based on 148 specimens collected at the eastern Colombian Andes. Detailed data on environmental and biological preferences are included in the description. The validity of characters such as the number of labral teeth and the clypeal setae to separate Taeniolinum species is also evaluated.

Keywords: Myriapoda, Ballophilidae, Centipede, Soil fauna, Tropical Montane forest


Order Geophilomorpha 
Suborder Adesmata 

Family Ballophilidae 
Genus Taeniolinum Pocock, 1893

FIGURE 4. Specimen of Taeniolinum neusicus sp. n. found inside a dipteran pupa, probably while brooding.
(Photo: Esteban Tulande-M).

Taeniolinum neusicus sp. n.

Etymology: The specific epithet is a latinized adjective, in masculine form, derived from the name of the type locality, Parque Forestal Embalse del Neusa

Type locality: Colombia: Eastern Andes Mountains: Cundinamarca: Parque Forestal Embalse del Neusa and .... 

Habitat and ecological considerations. This is the first record of the genus Taeniolinum in Colombia and the Andes Mountains, the specimens were collected at two tropical high montane forest patchs (Figure 3) within an altitudinal range of 2700 to 3200 meters above sea level, which is a new distribution range for Taeniolinum, as well as the maximum altitude at which it the genus has been recorded.  
....


 Esteban Tulande-M., César Camilo Prado and Hernán Darío Triana. 2018. The First Taeniolinum from the Andes Mountains and Colombia (Chilopoda: Geophilomorpha).   Zootaxa. 4532(1); 113–124.  DOI: 10.11646/zootaxa.4532.1.7

   

Saturday, December 15, 2018

[Arachnida • 2018] Four New Troglophilic Species of Loxosceles Heinecken & Lowe, 1832 (Araneae, Sicariidae): Contributions to the Knowledge of Recluse Spiders from Brazilian Caves


[upper]  Loxosceles ericsoni  Bertani, von Schimonsky & Gallão, 2018;
[lower]  L. cardosoi Bertani, von Schimonsky & Gallão, 2018

in Bertani, von Schimonsky, Gallão & Bichuette, 2018. 

Abstract
Four new species of recluse spiders from Brazilian caves are described with both males and females. Loxosceles ericsoni Bertani, von Schimonsky & Gallão, sp. n. and L. karstica Bertani, von Schimonsky & Gallão, sp. n. both occur in caves in the Peruaçu region, located in the northern area of the state of Minas Gerais; L. karstica sp. n. is additionally found in the Serra do Ramalho karst area, located in the southwestern region of the state of Bahia. These two species belong to the gaucho group. Loxosceles carinhanha Bertani, von Schimonsky & Gallão, sp. n. and L. cardosoi Bertani, von Schimonsky & Gallão, sp. n. occur exclusively in caves of the Serra do Ramalho karst area and belong to the rufescens/amazonica species group. The discovery of two additional and highly distinct species in the rufescens/amazonica group (L. carinhanha sp. n. and L. cardosoi sp. n.) increases the debate on the origin, evolution, and geographical distribution of this widely distributed group of recluse spiders in the New and Old World. The presence of three species (L. ericsoni sp. n., Lcarinhanha sp. n., and Lcardosoi sp. n.) with marked differences in morphological characters in a relatively small area indicates that the region seems to be an important center for Loxosceles diversity, which remains poorly studied.

Keywords: Bahia, brown spider, karst area, Minas Gerais, taxonomy


 Living specimens in their habitats.
55 Loxosceles ericsoni sp. n. female, Bonita Cave, Peruaçu Caves National Park, Januária, state of Minas Gerais, Brazil
56, 57 Loxosceles cardosoi sp. n., Gruna da Altina Cave, Serra do Ramalho karst area, Carinhanha, state of Bahia, Brazil. 56 Female 57 Male.

Photographs by PP Rizzato (55), ME Bichuette (56, 57). 


 Rogério Bertani, Diego M. von Schimonsky, Jonas E. Gallão and Maria E. Bichuette. 2018. Four New Troglophilic Species of Loxosceles Heinecken & Lowe, 1832: Contributions to the Knowledge of Recluse Spiders from Brazilian Caves (Araneae, Sicariidae). ZooKeys. 806: 47-72. DOI: 10.3897/zookeys.806.27404

[Ichthyology • 2018] Bythaelurus stewarti • A New Microendemic Species of the Deep-water Catshark Genus Bythaelurus (Carcharhiniformes, Pentanchidae) from the northwestern Indian Ocean, with Investigations of Its Feeding Ecology, Generic Review and Identification Key


Bythaelurus stewarti  
Weigmann, Kaschner & Thiel, 2018


Abstract
A new deep-water catsharkBythaelurus stewarti, is described based on 121 examined specimens caught on the Error Seamount (Mount Error Guyot) in the northwestern Indian Ocean. The new species differs from all congeners in the restricted distribution, a higher spiral valve turn count and in the morphology of the dermal denticles. It is distinguished from its morphologically and geographically closest congener, B. hispidus (Alcock), by the larger size (maximum size 44 vs. 39 cm TL, maturity size of males 35–39 vs. 21–28 cm TL), darker fresh coloration and dark grayish-brown mottling of the ventral head (vs. ventral head typically uniformly yellowish or whitish). Furthermore, it has a strongly different morphology of dermal denticles, in particular smaller and less elongate branchial, trunk and lateral caudal denticles that are set much less densely and have a surface that is very strongly and fully structured by reticulations (vs. structured by reticulations only in basal fourth). In addition, the new species differs from B. hispidus in having more slender claspers that are gradually narrowing to the bluntly pointed tip without knob-like apex (vs. claspers broader and with distinct knob-like apex), more spiral valve turns (11–12 vs. 8–10) and numerous statistical differences in morphometrics. A review of and a key to the species of Bythaelurus are given.

Fig 1. Bythaelurus stewarti n. sp., holotype, ZMH 26251, adult male, 425 mm TL, in (A) lateral, (B) dorsal, and (C) ventral views. Scale bar: 5 cm.

 Fig 2. Bythaelurus stewarti n. sp., (A) paratype, ZMH 26253, gravid female, 425 mm TL, (B) paratype, ZMH 26252, juvenile male, 340 mm TL, and (C) paratype, ZMH 26253, female embryo, 137.3 mm TL in lateral views. Scale bars: 5 cm.

Bythaelurus stewarti Weigmann, Kaschner & Thiel n. sp.

Error Seamount Catshark

Diagnosis: A medium-sized Bythaelurus species with the following characteristics: body firm and slender; snout long (preorbital length 4.9–7.4% TL) and broad, bell-shaped in dorsoventral view with distinct lateral indention; pre-outer nostril length 0.6–1.4 times internarial space; preorbital snout length 0.7–1.1 times interorbital space; preoral snout length 0.8–1.7 times in mouth width; eye length 10.2–15.5 times in predorsal distance, 4.9–7.7 times in head length and 1.2–2.3 times eye height; head length 2.2–2.6 times width at level of maximum outer extent of anterior nostrils; head width at level of maximum outer extent of anterior nostrils 1.1–1.3 times width at level of lateral indention of head, 1.2–1.6 times preorbital length, and 8.1–10.1% TL; tongue and roof of mouth densely set with knob-like oral papillae; pelvic-fin anterior margin 1.6–3.5 times in pectoral-fin anterior margin; first dorsal-fin base 1.3–2.3 times in interdorsal space; length of second dorsal-fin inner margin 0.8–2.3 times in second dorsal-fin height; second dorsal-fin base length 5.1–8.9% TL; anal-fin base 0.7–1.9 times interdorsal space. Coloration: dorsally dark grayish-brown with rather indistinct dark blotches at nape, on flank, below both dorsal fins, and across caudal fin; ventral side grayish-white, usually with dark grayish-brown mottling on head. Upper jaw with 64–85 and lower jaw with 64–88 rows of small tricuspidate teeth with outer surface of crown furrowed by strong longitudinal ridges and strongly structured by reticulations; monospondylous trunk vertebrae centra 37–42, diplospondylous precaudal centra 37–45, total centra 125–140. Branchial, trunk and lateral caudal-fin dermal denticles loosely set, their surface very strongly and fully structured by reticulations. Claspers rather long and very slender, gradually narrowing to bluntly pointed tip without knob-like apex, inner margin length 10.1–11.3% TL, base width 1.4–1.5% TL; clasper hooks present along inner edge of large exorhipidion, large envelope overlapping part of clasper groove, inner lobe with rhipidion, cover rhipidion, pseudopera and pseudosiphon. The reproductive mode is yolk-sac viviparous. Bythaelurus stewarti n. sp. differs from all congeners in the distribution, which is apparently restricted to the Error Seamount. It further differs from all congeners in a higher spiral valve turn count (11–12 vs. 6–10) and in the morphology of branchial, trunk and lateral caudal-fin dermal denticles, which are loosely-spaced and not overlapping even in adult specimens of the new species, whereas they are closely-set and overlapping in all other Bythaelurus species. Compared to its morphologically and geographically closest congener, the new species further differs in a larger size, a ventral head with dark mottling, claspers that gradually narrow to the bluntly pointed tip without knob-like apex, and a surface of dermal denticles that is very strongly and fully structured by reticulations.


Fig 18. Map of the Indian Ocean depicting the verified occurrences of nine species of Bythaelurus in the Indian Ocean.
The occurrences are based on examined material except for B. clevai (based on one examined specimen plus catch locations of the type specimens taken from Séret [12] and B. alcockii (no specimen available, catch location of the lost holotype indicated as Arabian Sea in Garman [40]). Bythaelurus alcockii: black pentagon, B. bachi: black stars, B. clevai: white triangles, B. hispidus: black (holotype) and white (other specimens) circles, B. lutarius: black triangles, B. naylori: white stars, B. stewarti n. sp.: black and white diamonds, B. tenuicephalus: white squares, B. vivaldii: black square. Inset of the Gulf of Aden area depicts the catch locations of the holotype (black diamond) and paratypes (black and white diamonds) of Bythaelurus stewarti n. sp. on Error Seamount and catch locations of 100 comparative specimens of B. hispidus from off the Socotra Islands (white circles). Country abbreviations follow ISO 3166–1 (OM = Oman, SO = Somalia, YE = Yemen).

Distribution: The new species is known only from the Error Seamount (Mount Error Guyot) in 380–420 m depth (see map in the Discussion section). It is apparently a microendemic species restricted to this isolated Seamount.

Etymology: The new species is named after the late filmmaker and shark conservationist Rob Stewart, who inspired the second author and stimulated her interest in sharks.



Simon Weigmann, Carina Julia Kaschner and Ralf Thiel. 2018. A New Microendemic Species of the Deep-water Catshark Genus Bythaelurus (Carcharhiniformes, Pentanchidae) from the northwestern Indian Ocean, with Investigations of Its Feeding Ecology, Generic Review and Identification Key.  PLoS ONE. 13(12): e0207887. DOI:  10.1371/journal.pone.0207887

Thursday, December 13, 2018

[Mammalogy • 2019] Plecturocebus grovesi • A New Species of Titi Monkey (Primates: Plecturocebus Byrne et al., 2016), from Alta Floresta, southern Amazon, Brazil


Plecturocebus grovesi
Boubli, Byrne, Silva, Silva-Júnior, Araújo, et al. 2019. 


Highlights: 
• We describe a new species of Plecturocebus of the Eastern Amazon Clade.
• Genomic (ddRADseq) and mitochondrial data support monophyly of the new species.
• The new species is sister to P. moloch+P. vieirai..
• We predict a total loss of 86% of the new species habitat in the next 24 years.
• The new species can be categorised as Critically Endangered under IUCN A3c criterion.

Abstract
The taxonomy of the titi monkeys (Callicebinae) has recently received considerable attention. It is now recognised that this subfamily is composed of three genera with 33 species, seven of them described since 2002. Here, we describe a new species of titi, Plecturocebus, from the municipality of Alta Floresta, Mato Grosso, Brazil. We adopt an integrative taxonomic approach that includes phylogenomic analyses, pelage characters, and locality records. A reduced representation genome-wide approach was employed to assess phylogenetic relationships among species of the eastern Amazonian clade of the Plecturocebus moloch group. Using existing records, we calculated the Extent of Occurrence (EOO) of the new species and estimated future habitat loss for the region based on predictive models. We then evaluated the species’ conservation status using the IUCN Red list categories and criteria. The new species presents a unique combination of morphological characters: 1) grey agouti colouration on the crown and dorsal parts; 2) entirely bright red-brown venter; 3) an almost entirely black tail with a pale tip; and 4) light yellow colouration of the hair on the cheeks contrasting with bright red-brown hair on the sides of the face. Our phylogenetic reconstructions based on maximum-likelihood and Bayesian methods revealed well-supported species relationships, with the Alta Floresta taxon as sister to P. moloch P. vieirai. The species EOO is 10,166,653 ha and we predict a total habitat loss of 86% of its original forest habitat under a “business as usual” scenario in the next 24 years, making the newly discovered titi monkey a Critically Endangered species under the IUCN A3c criterion. We give the new titi monkey a specific epithet based on: 1) clear monophyly of this lineage revealed by robust genomic and mitochondrial data; 2) distinct and diagnosable pelage morphology; and 3) a well-defined geographical distribution with clear separation from other closely related taxa. Urgent conservation measures are needed to safeguard the future of this newly discovered and already critically endangered primate.

Keywords: Callicebinae, Plecturocebus moloch, New species, Alta Floresta, Amazon


 Plecturocebus grovesi, Alta Floresta titi monkey.

Photo by Fabiano Melo.

Plecturocebus grovesi sp. nov.
Alta Floresta titi monkey

Etymologyซ We named the Alta Floresta taxon after Professor Colin P. Groves (1942–2017) in recognition of his lifelong, preeminent contributions to mammalian taxonomy and systematics, and in particular, primate taxonomy.

Fig. 19. Extent-of-occurrence for Plecturocebus grovesi sp. nov. in the Juruena/Arinos – Teles-Pires interfluvium, and the current and predicted future habitat loss for the species due to deforestation by 2042 under the “Business as Usual” scenario.

Conclusions: 
Our decision to give new species status to the Alta Floresta taxon was based on: 1) clear monophyly of this lineage revealed by robust genomics data and analysis; 2) an exclusive combination of diagnosable pelage characters; and 3) a well defined geographic distribution with clear separation from other closely related taxa. All lines of evidence indicate that Plecturocebus grovesi sp. nov. is a separately evolving lineage in agreement with the unified species concept of de Queiroz (2007), and also with what Mayden (1997, p. 407) refers to as the “diagnosable and monophyly version” of the Phylogenetic Species Concept (sensu Cracraft, 1983). The new species is found in one of the areas of Brazil where forest is most rapidly disappearing due to the advancing agricultural frontier. Urgent conservation measures are thus needed to safeguard the future of Plecturocebus grovesi sp. nov.


 Jean P. Boubli, Hazel Byrne, Maria N.F. da Silva, José Silva-Júnior, Rodrigo Costa Araújo, Fabrício Bertuol, Jonas Gonçalves, Fabiano R. de Melo, et al. 2019. On A New Species of Titi Monkey (Primates: Plecturocebus Byrne et al., 2016), from Alta Floresta, southern Amazon, Brazil. Molecular Phylogenetics and Evolution. 132; 117-137. DOI: 10.1016/j.ympev.2018.11.012 


[Ichthyology • 2018] Gymnogeophagus peliochelynion • A New Mouth Brooder Species of Gymnogeophagus with Hypertrophied Lips (Cichliformes: Cichlidae) from A Tributary of the río Uruguay


Gymnogeophagus peliochelynion
Turcati, Serra-Alanis & Malabarba, 2018


ABSTRACT
A new mouth breeder species of Gymnogeophagus is described from a tributary of the río Uruguay. It is distinguished from most species of the genus by the presence of hypertrophied lips, and from G. labiatus and G. pseudolabiatus by the color pattern. The presence of successive allopatric species of the Gymnogeophagus gymnogenys clade inhabiting the tributaries of the río Uruguay is discussed.

Keywords: Distribution; Endemism; Gymnogeophagus gymnogenys clade; New species; Río Uruguay

Fig. 2 Head of Gymnogeophagus peliochelynion (first column), G. pseudolabiatus (second column) and G. mekinos (third column) showing the entirely black hump in males in G. peliochelynion (vs. yellow with black margin), and upper lip not folded dorsally over anterior margin of snout (vs. upper lip folded dorsally in G. pseudolabiatus and undeveloped in G. mekinos).
G. peliochelynion from top to bottom, paratype, ZVC-P 13210, paratype, 76.3 mm SL; ZVC-P 7016, 89.9 mm SL; ZVC-P 13057, 90.2 mm SL.
 G. pseudolabiatus from top to bottom, paratype, UFRGS 7754, 102.0 mm SL; MHNM 4010, 88.8 mm SL; MHNM 4010, 95.3 mm SL.
G. mekinos from top to bottom, MHNM 3511, 105.1 mm SL; MHNM 3511, 97.2 mm SL; MHNM 4009, 121.3 mm SL. 

Fig. 4 Gymnogeophagus peliochelynion: top, holotype, male, ZVC-P 12493, 101.9 SL; bottom, paratype, female, UFRGS 8076, 77.2 SL. Both from arroyo de las Tunas on road 31, tributary of río Arapey Grande, Salto, Uruguay. Photographs taken just after collection and fixation in formalin.

Gymnogeophagus peliochelynion, new species

Diagnosis. The new species can be distinguished from the species of the Gymnogeophagus rhabdotus group and from G. balzanii by the shape of the caudal peduncle longer than deep (vs. deeper than long). It is distinguished from all congeners, except G. labiatus and G. pseudolabiatus, by the possession of thick lips. It differs from G. labiatus and G. lacustris by the lack of an oblique bar from the eye to the dorsal-fin origin (vs. oblique bar present), and by the color pattern of the caudal, dorsal and anal fins with dots (vs. caudal fin and posterior portion of anal fin with longitudinal hyaline stripes). It differs from G. pseudolabiatus and G. mekinos by the hump entirely black in males (Fig. 2; vs. yellow with black margin), and upper lip not folded dorsally over anterior margin of snout (vs. upper lip folded dorsally, usually with a well-developed medial lobe dorsally projected in G. pseudolabiatus).
....

Ecological notes. The new species was collected in rivers with clear water, usually with rocky or muddy bottom and little vegetation.

Etymology. The name peliochelynion is from the Greek pelios, meaning black and blue, and chelyne, meaning lip, in reference to the color of the lips of the new species. A name in apposition.

Fig. 5 Gymnogeophagus peliochelynion: above, paratype, male, ZVC-P 13210, paratype, 76.3 mm SL, río Arapey, Colonia Lavalleja, Paso Elías, Salto, Uruguay; below, female, ZVC-P 13057, 65.3 mm SL, Arroyo Sopas, Paso del Cementerio, Salto, Uruguay. Photographs of live specimens.


Andréia Turcati, Wilson Sebastián Serra-Alanis and Luiz R. Malabarba. 2018. A New Mouth Brooder Species of Gymnogeophagus with Hypertrophied Lips (Cichliformes: Cichlidae). Neotrop. ichthyol. 16(4). DOI: 10.1590/1982-0224-20180118 

RESUMEN: Una nueva especie incubadora bucal de Gymnogeophagus es descripta de un tributario del Río Uruguay. Se distingue de la mayoría de las especies del género por la presencia de labios hipertrofiados, y de G. labiatus y G. pseudolabiatus por su patrón de coloración. Se discute la presencia de sucesivas especies alopátricas del clado Gymnogeophagus gymnogenys habitando los tributarios del Río Uruguay.

Palabras Clave: Distribución; Endemismo; Clado Gymnogeophagus gymnogenys; Especie nueva; Río Uruguay